/*
 * Copyright (c) 2009 Johnny Mast
 * 
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

#import "Vector2D.h"

Vector2D 
Vector2DMake(XFFloat x, XFFloat y)
{
	Vector2D newVector = { x, y };
	return newVector;
}

Vector2D 
Vector2DAdd(Vector2D v1, Vector2D v2)
{
	// Tail to head
	return Vector2DMake(v1.x + v2.x, v1.y + v2.y);
}

Vector2D 
Vector2DSubstract(Vector2D v1, Vector2D v2)
{
	return Vector2DMake(v1.x - v2.x, v1.y - v2.y);
}

Vector2D 
Vector2DInvert(Vector2D vector) {
	return Vector2DMake(-vector.x, -vector.y);	
}

Vector2D 
Vector2DScale(Vector2D vector, XFFloat scale)
{
	return Vector2DMake(vector.x * scale, vector.y * scale);
}


XFFloat 
Vector2DCrossProduct(Vector2D v1, Vector2D v2)
{
	return v1.x*v2.y - v1.y*v2.x; /* Basicaly L * W - H */
}


XFFloat 
Vector2DDotProduct(Vector2D v1, Vector2D v2) {
	return v1.x*v2.x + v1.y*v2.y;

}


XFFloat 
Vector2DMagnitude(Vector2D vector) 
{
	return (vector.x * vector.x + vector.y * vector.y);
}